Display screen with a graphical user interface of a card reader application



The FIGURE is a front view for a display screen with a graphical user interface of a card reader application, showing the new design;

The broken lines in the drawings illustrate portions of the display screen with a graphical user interface of a card reader application that form no part of the claimed design. 

CLAIM We claim the ornamental design for a display screen with a graphical user interface of a card reader application, as shown and described. 